Greenland Institute of Natural Resources, PO Box 570, Nuuk, 3900, Greenland; School of Natural Resources and Extension, University of Alaska Fairbanks, Fairbanks, AK 99775, United States; Wildlife Division, Environment and Natural Resources, Government of Northwest Territories, PO Box 1320, Yellowknife, NT X1A 2L9, Canada; BC Ministry of Forests, Lands, Natural Resources Operations and Rural Development, 2000 South Ospika Blvd, Prince George, BC V2N 4W5, Canada; Animal Resources Center, University of Alaska Fairbanks, PO Box 756980, Fairbanks, AK 99775, United States; Norwegian Environment Agency, PO Box 5672 Torgarden, Trondheim, 7485, Norway; Department of Wildlife Management of Northern Québec, Ministry of Forests, Wildlife and Parks of Québec, 951 Hamel Boulevard, Chibougamau, QC G8P 2Z3, Canada; Department of Environment, Government of Nunavut, PO Box 120, Arviat, NT X0C 0E0, Canada; Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, 3280 Hospital Drive NW, Calgary, AB T2N 4Z6, Canada; Environment and Natural Resources, Government of the Northwest Territories, PO Box 2668, 3803 Bretzlaff Drive, Yellowknife, NT X1A 2P9, Canada; Département de biologie & Centre for Northern Studies, Université Laval, 1045 avenue de la Médecine, Québec, G1V 0A6, Canada; Department of Environment and Natural Resources, Wildlife Management, Inuvik Region, PO Box 2749, Inuvik, NT X0E 0T0, Canada; Umingmak Productions Inc., Kugluktuk, NU X0B 0A2, Canada; Nunavik Research Centre, Makivik Corporation, PO Box 179, Kuujjuaq, QC J0M 1C0, Canada; Wrangel Island State Reserve, Pevek, 689400, Russian Federation; 368 Roland Road, Salt Spring Island, BC V8K 1V1, Canada; Division of Wildlife Conservation, Alaska Department of Fish and Game, PO Box 1467, Bethel, AK 99559, United States; Department of Environment, Government of Nunavut, PO Box 377, Kugluktuk, NU X0B 0A2, Canada; Department of Environment, Government of Nunavut, PO Box 209, Iglulik, NU X0A 0L0, Canada; Institute of Biological Problems of Cryolithozone of the Siberian Branch of Russian Academy of Science (IBPC SB RAS), 41 Lenina Ave., Yakutsk, 677980, Russian Federation; PO Box 80843, Fairbanks, AK 99775, United States; Arctic Research Centre, Department of Bioscience, Aarhus University, Frederiksborgvej 399, Roskilde, 4000, Denmark; Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, PO Box 11, Moscow, 119071, Russian Federation; Inuvialuit and Migratory Caribou, Fish and Wildlife, Environment Yukon, PO Box 600, Dawson City, YT Y0B 1G0, Canada; Polar Knowledge Canada, Canadian High Arctic Research Station, 1 Uvajuq Road, PO Box 2150, Cambridge Bay, NU X0B 0C0, Canada; Norwegian Institute for Nature Research (NINA), PO Box 5685 Torgarden, Trondheim, 7485, Norway